package com.atguigu.gulimall.product.service.impl;

import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;
import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        // 查出所有分类

        List<CategoryEntity> categoryEntities = baseMapper.selectList(null);

        // 开始组装父子

        // 找所有的一级分类

        List<CategoryEntity> level1Menus = categoryEntities.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == 0;
        }).map((menu) -> {
            menu.setChildren(getChildrens(menu, categoryEntities));
            return menu;
        }).sorted((menu1, menu2) -> {
            return menu1.getSort() - menu2.getSort();
        }).collect(Collectors.toList());

        return level1Menus;
    }

    @Override
    public void removeMeunsByIds(List<Long> asList) {

        // TODO 是否有业务用到删除菜单逻辑

        baseMapper.deleteBatchIds(asList);
    }

    //递归查找子菜单
    private List<CategoryEntity> getChildrens(CategoryEntity root, List<CategoryEntity> all) {
        List<CategoryEntity> childrens = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(categoryEntity -> {
            categoryEntity.setChildren(getChildrens(categoryEntity, all));
            return categoryEntity;
        }).sorted((menu1, menu2) -> {
            return menu1.getSort() - menu2.getSort();
        }).collect(Collectors.toList());

        return childrens;

    }

}